Deviator for range finders



Je l0 1924.-` 1,497,235

V. H. GODILLONv DEvIAToR FOR RANGE FINDERS Filed .June 1s, 1922 @g1ffii# T? EN -l Attorneys Patented June 10, 1924.

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VICTOR HONOR GODILLO'N, OF PAB/1S, FRANCE, ASSIGNOR TO SOCIETE DOPTIQUEET i DE MECANIQUE DE HAUTE EREXSXON, PAR-IS, FRANCE, A. JOINT-STOCK COM-PANY OF FRANCE.

DEVIATOR FOR RANGE FINDER-S.

Application filed June 13, 1922. Serial No. 567,950.

To all whom t may concern.'

Be itknown that I, VICTOR HoNoR Go- DILLON, a citizen of the Republic ofFrance, residing at 125 Boulevard Davout, Paris,

France, have invented new and useful Improvements in Deviators for RangeFinders, which is fully set forth in the following speciiication.

The present invention relates to an improved deviator for range-finders.

Deviators for coincidence range-iinders or for stereoscopicrange-finders' have heretofore been provided, comprising twoplanoparallel glass plates mounted at a suitable angle relatively to thelongitudinal optical axis of the apparatus, and adapted to receivesimultaneously by means of a suitable actuating device, rotationalmotion around the said aXis.

In the constructional form described and illustrated in the patentto-Fouasse, No. 1,370,530, dated March S, 1921, the two glass plates aremounted symmetrically in relation to the plane of the transverse aXis ofthe apparatus.

Compared to the use of afsingle glass plate, the employment of twoplano-parallel glass plates has the advantage of avoiding all verticaldifference between the two images. Nevertheless when the two glassplates are arranged as in the constructional form described above, thetwoy images certainly do remain on one and the same horizontal line, butthis said horizontal line of the object. The result is that the imagesof two objects situated at different distances and in the samealignment, instead of being seen on the same horizontal line, actuallyappear to be situated on horizontal lines of different altitudes orlevels.

Under those conditions the range-Finder cannot be used satisfactorilyfor measuring the site angles or in cases involving a site angle, forinstance, in a combined telemeter and altimeter. i

The present invention provides an improved deviator embodying theapplication of the same principle of using two planoparallel glassplates, but allowing of correct-ing the unavoidable verticaldisplacements of the images according to the distance oit the object.

varies in altitude according to the distance Theinvention will besty beunderstood byv reference to the accompanying drawing whereinfi Y Fig. 1ydiagrar'nmatically illustrates one principle' of the invention;

Fig. 2 is a verticalfsectional detail of one embodiment of the present'rinvention installed in the innerA tube of a' range finder;

Fig. 3 is a section taken o-n line 3 3 of Fig. 2;

Fig. 4 is a view similar to Fig. 2, after the glass plates have beenrotated through an angle of 90;

Fig. 5 is a section taken on line 5--5 of Fig. 4c; i

Figs. 6 and 7 are diagrammatic views illustrating the efl'ects'ofemploying a single glass plate; and

Fig. 8 is a diagrammatic showing of the results obtained by employing myimprovedA the axis of the range-linder at equal speeds but in oppositedirections. Thus they start from one position (the position indicated inthe diagram) in which they' are parallel to each other, that is, aposition of zero o deviation, a'iidthey can receive varying relativeinclinations upto ay maximum, laccording to the angle through which theyhavebeen rotated. l l y In Figures 2 and 3 the glass platesoccupy theposition ot zero deviation, that is to say, the position they have asshown-diagrammatically in Figure 1.

The sleeves or mounts IB, B are capable of rotating by means of ballbearings around the axis cto:, and for this purpose, they are providedwith teeth meshing with a common driving pinion D lined,k on a shaft dwhich is driven by any suitable gear d1, cl2, d5.

Figure 4 shows the glass ,plates after each one has been rotated throughthus brought into a position of intermediate deviation.

In case an object were sighted through a range-finder having knodeviator, the rays ot klight from said object enteringtheend Windows ofthe range-finder Would be directed, in a manner ivell known inthe art7to the point O oteie-piec'e F. If a single planoparallel glass plate C.,placed in the position shown in Figs.A 2 and 3, were used as a deviator,the image oit the observed objectwould be seen in eye-piece F at P (Fig.6).

If asingle plate C', positioned as shown in Figs. 2 and', were used as adeviator.

animageo'tv the object would be seen inthe eye-piece at P2 (Fig. 7

It this singlev glass plate were rotated through a'n angle oi,I theobjvect instead' of being seen 4at Pwould'beseen at 'Q'. havingdescribed 4the arev of a circle' P"-Q.

The same object would be 'seen at P2, hav-V ing been "'devi'atedbi7 the'glass plate which then occupies"the'position shown in Figures 2 and 3.After this glass plate has beenrotatedlthrongh an angle ein the reversedirec'- tion'of the rotation of the" glass` 'plate C, theobj eet will bevisible at Q2, havinglde'seribed the are' of a circle P2-Q2.

Oia-fing to the employment of the tivo glass plates@ and C mountedinaccorda-nce with the present invention, the image ofthe saine objectis visible at P !(F ig. 8) when the' glass plates are occupying thepositions slioivn in Figures 2 and 3. l

lVhen the tivo glass plates are rotated' in opposite directions through'the same angle' a. the' resultant image ot the images Q and Q2 isvisibleat Q on' the horizontal lineV 1. A deviator for range-finderscomprising' a pair of plano-parallel glass plates revolvabl).v mountedto intercept the rays ofl light proceeding trom'one oi the end Windowsof a range-i'inder7 and means 'tor revolving said plates in oppositedirections around the longitudinal axis ot the range-finder. n

2. il deviator for a range-finder comprising a pair of annular membershaving gear teeth formed on the contiguous faces thereof rotatablymounted in one end of said range-iinder, a pair of plano-parallel glassplates mounted, one in each of said members, a pinion engaging the teethot` said meinbers, and means for rotating said pinion 3. A deviator fora range-finder comprising a pair of annular members mounted to rotateabout the longitudinal axis of saidI range-finder in tivo parallelplanes substansaid asis' and means for rotating said plates in oppositedirections about said axis, said plates being positioned to interceptthe 'rays of light proceeding from'one of the endavin-4 doivev ot saidrange-finder.

4Q in a device ott the'eiass described, the-` combination oit apluralityv of' plano-pfniillel glass plates mounted to rotate about the'longitudinal axis of a range-finder andh'mclined to said axis. and meanstor simultaneously' rotating the members in opposite directions.

said members being positioned to intercept' the rays of light proceedingfrom one ot' the end Windows ot said range-finder. 4

A deviator for range-finders comprising tivo plano-parallel glass platesmovable aroundA and inclined relative topthe longitudinal axis ot therange-finder ai'id'moun'ted on one and the saine side of one of theerecting prisms of said range-inder1 and means for moving said plates inopposite directions' around said axis whereby the two images ot theobjecten which the distance is to' beobtained will always be torn'ied ona horizontal line passing through the centers of the evepieces ot saidrange-finder;

ln testimonyv Whereoi lV have"signedI this:`

speeitieation.

ricrea riesen

